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Subject: Dogfight tricks ...
Bluewings12    4/22/2009 6:07:56 PM
A M2000-5 Pilot here in Dijon ~a friend of mine~ told me that He and his aircraft can leave any other following aircraft in the dust with one pass . When I asked "any aircraft ?" , he said yes and he directed me to that video : h*tp://www.dailymotion.com/video/x3424v_french-air-force-mirage-20005_shortfilms He said to me , check from 1:12 to 1:28 . He explained to me that the Mirage is diving instantly nose first with a negative 4Gs plunge , followed by a 6g plate then followed by an 11g 180deg turn , the end speed is close to 300 knots . He said to me , "imagine where the bugger who is following you ends up ? NOWHERE !" To start with , 99% of the Pilots will not plunge nose first but will make a roll to dive "against the Gs" . There are 3 reasons to do so : #1 to avoid the "red-out" , # the FBW is not at ease , #3 you need a delta wing . When I asked him how he could turn the situation to his advantage , his answer was simple : "keep turning high Gs left or right , depends where he went and you 'll end up behind him , if he goes vertical go vertical too , he will ALSO be in front of you" Please , post some other nice videos of good dogfight tricks :-) Cheers .
 
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warpig       5/12/2009 7:29:01 PM

OMG!  You are more obnoxious than BW and FS combined!  I predict you definitely will not be on this website much longer.  People who show up only to post argumentative post after argumentative post fit the definition of troll, and are soon banned.

 

At no time while bringing up G onset rates have I been talking about the effect of G loads on airframes.  You and BW made some comments about pilots coping with high G loads, and about instantaneous turn rates and pointing the nose while avoiding high Gs.  I pointed out the fact that GLOC is not only caused by sustaining too many Gs, but can also be caused by sustaining an onset rate of Gs that is too high even though the maximum G level never gets high enough to itself cause GLOC.  You proceeded to bring up some useless observation about how the units of acceleration are m/s2, how the value of G varies slightly around the globe and cited some numbers ("variations ranging from, 0.26 to -0.27") without any units or explanation of what you thought they mean, and something about the airframe.  Even though it added nothing of value to a discussion of pilots blacking out under high Gs or under high G rates, I tried to play along and decipher what your reference to 0.26 to -0.27 was supposed to mean, so I offered a guess as to what the fluctuation of G is around the globe.  Then I tried to clarify that I was talking about how fast the load factor is changing and its effect on the pilot.  You responded with more crap about the merits of typing "G onset" v. "g onset", a table showing values for gravity around the globe, appear to still think I'm talking about something to do with the airframe, and tell me the units of G onset are m/s2.  I read the table out of curiousity, saw that the numbers you cited were percentages, explained what that meant in terms of my previous posts and what it seemed to me you might be saying in yours, and proceeded to explain for the third time that I was talking about the effect of total Gs on the pilot and the effect of rapidly increasing the Gs on the pilot, and how a high onset rate can in itself cause loss of consciousness even if the maximum G never gets to the level that in itself would cause black out.  Oh, and I also pointed out that G onset rate--which is what I've been talking about this whole time, and which you have been responding to this whole time--units would actually be m/s3, not m/s2.  You responded by dodging away from the whole diversonary subject you started regarding the variation in the value of G around the globe, and completely missing yet again the implications of the difference between m/s2 and m/s3; what part of m/s3 don't you understand?  Here's yet another hint:  G by itself is an acceleration, not a rate of acceleration, whereas G onset rate is a rate of acceleration, and G onset rate could also be expressed in units of G/s as well as m/s3, but not as m/s2 or G (not that I really care, as my point is about its effects on the pilot, not what units to use, but you seem insistent on talking about it).  Finally you clearly demonstrate you still are completely lost as to what I have explained at least three times (four times counting this post) using different words and terminology each time in an attempt to make it clear to you, and say something about roll rates and "g onset" during rolls of "up to 15 g"--whatever that's supposed to mean, as clearly it is not experiencing 15G in any axis of motion--and somehow you extrapolate that to mean something about load factor in pitch (slyly weaving in Seagull's contribution regarding Rafale's flight control system--thank you Seagull for being the only Frenchman I've seen on StrategyPage in over six years who is knowledgable *and* makes useful, positive contributions).  You obviously still don't realize that "G onset rate" is a well-known term used in human factors studies and has been heavily researched for decades.  You are truly a great big peter.

 

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warpig       5/12/2009 7:42:26 PM
I said, "You obviously still don't realize that "G onset rate" is a well-known term used in human factors studies and has been heavily researched for decades."
 
I should have said:
You obviously still don't realize that "G onset rate" is a well-known term used in human factors studies and has been heavily researched for decades.  That doesn't matter to me, and I'm happy to explain the little bit about it that I know.  However, what's inexcusible is your attitude of trying to appear like you do know something about it, splattering a collage of crap onto the boards in a seeming attempt to appear to know something about it, and responding in a ridiculously aggressive fashion while you're at it.  You should know that you do not have to muster up some sort of post merely to be seen as being able to respond every time.  It's okay not to post about a subject.
 
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gf0012-aust       5/13/2009 2:39:39 AM

I'd argue that using Red Bull aircraft as a comparison is hardly accurate as the aircraft are designed for continual high g stressing,

Well this must be the quote of the year.

Manufacturers the world over are fighting about Max sustained turn rates and you vcame up over here telling us that they do not design the most agile dogfighter to sustain these?

Allow me to laugh, as for RebBull aircrafts some of the pilot pulling 11g publicly, your guys notions on the margins is to say the least lacking.


/civility off

ok, since you've decided to continue to act like a prat. lets go back and ask some basic questions.

acrobatic aircraft are designed for sustained high stress manouvre
jet powered combat aircraft typically have Frame Stress Alerts triggering at 7.5+G  The reason?  Your understanding therefore of alerts built into planes is therefore more than amusing otherwise you would no they exist and when they're triggered.  You need to get off Google and speak to someone who maintains aircraft, or someone who is familiar with such simple things as Frame Stress Alerts.  Just because the alert triggers doesn't mean that the plane can't go beyond it - it's a precautionary alert and its there for a reason.  

It's to alert the pilot that the aircraft is entering a state that should not be maintained.  The frame can go catastrophic if pushed, - any frame can go from fluid/plastic/elastic to hitting a catastrophic collapse if not monitored.  Hence the alerrts.  Just because the platform can go to a higher G doesn't mean that it should be done as a habit - all frames have tolerances etc...  but doing the biggles bit is not smart or expected in peace time conditions.

Its why aircraft that trigger stress alerts will be pulled for a inspection, or are you now suggesting that AdA ignores the alerts because the aircraft don't need inspection all the way up to 11g? 

how in gods name do you equate the design of an aircraft like an acrobatic Sukhoi where the through frame loads are vastly different to a jet engined combat aircraft.?  the design and load rates are different.

btw, before reacting like an egomaniac, make the effort to read where and when I came in on this conversation.  the fact that you think that there is a parallel between stress loads that are able to be regularly realised in an acrobatic aircraft and a jet fighter is laughable.

if a french pilot tried to treat his rafale like a pitts special or a sukhoi acrobatic, I'm guessing that the maintainers  would be ripping him a new rectum for overriding or ignoring the alerts with gay abandon.

 

 
 
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PierreLeGrand       5/13/2009 6:47:11 AM

OMG!  You are more obnoxious than BW and FS combined!  I predict you definitely will not be on this website much longer.  People who show up only to post argumentative post after argumentative post fit the definition of troll, and are soon banned.


You are truly a great big peter.


 God send us a Frenchman who doesn't have a chip on his shoudler the size of a millstone, and an ego that does not completely blind his intellect.


 

 

Boy:

  Please stop taking your standards for universal and keep your familiarities for yourself.

 

  I perfectly know what I am writing and don?t need to you put down everything you recently read about it to try to make up you know it the slightest, if you did, all you could be able to say about it is that you have too little data to assume half of what you are writing.

 

You and BW made some comments about pilots coping with high G loads, and about instantaneous turn rates and pointing the nose while avoiding high Gs

 

 I don't need to avoid anything apart for confrontational flamers who have for last resort spin and personal attacks including on others nationalities.

 

  The little picture I posted for your education is crystal clear and reflect realities that your limited theotrical knowledge can't foresee, I thought you'd be smart enough to step on it and try to comprehend this but you aren?t.

 

  Before reaching any number of g there are a few parameters any aircraft will have to meet, and these are clearly explained to you in three axis.

 

  Your theory about g onset is physically INVALID and cannot be expressed otherwise than as a pick value, other than that it have to be experienced practically because as this matrix shows there are too many unknown i.e. aerodynamic like mechanical.

 

  Something you apparently cannot possibly know since it takes some degree of practical experience for the most advanced for it to really hit a nerve, reason why flight engineers are.... Flyers and you, not experienced enough to cut it.

 

  What you demonstrate is that you are writing about a subject you know too little about.

 

 

 I pointed out the fact that GLOC is not only caused by sustaining too many Gs, but can also be caused by sustaining an onset rate of Gs that is too high even though the maximum G level never gets high enough to itself cause GLOC. 

 

  Again this theory of you proves to be totally impractical especially in the case

 
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Seagull       5/13/2009 8:58:17 AM
The G onset is expressed in  "G per second", or "Jolt" in French.
 
G Lock happens if you try to sustain high G turns for too long, but also if you ask for a very rapid G onset.
 
If you're on a level flight for example, 1G, bank on the left and pull on the stick to get 9G immediatly, on a modern fighter, you'll get it VERY rapidly. This is comparable to a shock.
 
For example, Typhoon has a G onset above 10G.s-1   (in m.s-2). This is very high. This is why they need the Libelle G-Suit to cope rapidly enough with such an onset, if they want to get the best from the plane.
 
A "mere" F-16 already provides with sufficient G onsets to knock their pilots. In regards to what happened with the F-16, French doctors required that Rafale's FCS include some limitations (so as to "smooth" the controls though M2000 pilots were already used to brutal maneuvers).
The man who told me this couldn't believe the >10G.s-1  of the Typhoon ("is the pilot a cyborg ?")
 

 
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PierreLeGrand       5/13/2009 9:30:50 AM

The G onset is expressed in  "G per second", or "Jolt" in French.

 

G Lock happens if you try to sustain high G turns for too long, but also if you ask for a very rapid G onset.

 

If you're on a level flight for example, 1G, bank on the left and pull on the stick to get 9G immediatly, on a modern fighter, you'll get it VERY rapidly. This is comparable to a shock.


 

For example, Typhoon has a G onset above 10G.s-1   (in m.s-2). This is very high. This is why they need the Libelle G-Suit to cope rapidly enough with such an onset, if they want to get the best from the plane.


 

A "mere" F-16 already provides with sufficient G onsets to knock their pilots. In regards to what happened with the F-16, French doctors required that Rafale's FCS include some limitations (so as to "smooth" the controls though M2000 pilots were already used to brutal maneuvers).


The man who told me this couldn't believe the >10G.s-1  of the Typhoon ("is the pilot a cyborg ?")

 





"Seagull       

 G Lock happens if you try to sustain high G turns for too long, but also if you ask for a very rapid G onset".

  True, but FCS are set for limits of up to 15 g because in reality in NO flight scenario this would actually occur.

 
"Seagull 
This is very high".

 Not necessarily considering the Typhoon have a lower Structural Maximum Load than most, this value reflect it perfectly, maxiomum g onset values aren't the equivalent to sustained g, they are a value for constant acceleration but represents theorical pick values not physical, sustained values.

 

"Seagull
This is why they need the Libelle G-Suit to cope rapidly enough with such an onset, if they want to get the best from the plane".

Not precisely, there are techniques to cope with high g values and pilots have long learnt to use them, the problem with high onset values is that often they have too little time to prepare for it.

 In many case they simply forget to, accident reports are full of such example, a pilot can black out a much lower g values than 9.

 

"Seagull
The man who told me this couldn't believe the >10G.s-1 of the Typhoon ("is the pilot a cyborg ?")"

Perhaps so but there is a difference between theories, laboratory conditions and combat conditions.

 What most of you doesn't realize is that the physiologic resistance to g of pilot is reduced by their level of stress and fatigue.

 Tyhoon g onset is ALSO a theorical pick value which would probably never been meet for as many reasons as there are topics in the maneuverability matrix Transient and Functional chapters.

In short, taken in isolation it only can be given as an indication of a theorical pick value.

Flight conditions, including speed, altitude, as well as mechanical and aerodynamic factors limit the aircraft so that its pick g onset value is never meet, the airframe Maximum Structura Load will be meet first and FCS will prevent this to happen.
  THIS in the event that the aircraft itself isn't limited by other factors.

To finish, you keep mentioning the example of the Rafale D which is a two seater, this means that the WSO will often have no idea what the pilot will do next expecially in combat, and face the very problem I have mentioned, lack of time to prepare himself for the maneuver.

This is the only reason for the suggestion your friend mentioned, aerobatic pilots pull often 11 g with very high g onset values and we rarely ear of crashes due to g-Locks while they ware no g suits.
 
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Seagull       5/13/2009 11:03:43 AM
PlG, can you explain me again what you call "G onset" ? (which you associate with the same unit as a mere acceleration, while "G onset" refers to the variation of an acceleration in the time)
 
Check this definition : fr.wikipedia.org/wiki/Jolt
 
 
 
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warpig       5/13/2009 11:58:57 AM

The G onset is expressed in  "G per second", or "Jolt" in French.

 

G Lock happens if you try to sustain high G turns for too long, but also if you ask for a very rapid G onset.

 

If you're on a level flight for example, 1G, bank on the left and pull on the stick to get 9G immediatly, on a modern fighter, you'll get it VERY rapidly. This is comparable to a shock.


 

For example, Typhoon has a G onset above 10G.s-1   (in m.s-2). This is very high. This is why they need the Libelle G-Suit to cope rapidly enough with such an onset, if they want to get the best from the plane.


 

A "mere" F-16 already provides with sufficient G onsets to knock their pilots. In regards to what happened with the F-16, French doctors required that Rafale's FCS include some limitations (so as to "smooth" the controls though M2000 pilots were already used to brutal maneuvers).


The man who told me this couldn't believe the >10G.s-1  of the Typhoon ("is the pilot a cyborg ?")

 





 
 
Seagull, please review my posts on this topic and let me know where in any of them I have said anything even slightly wrong or incomplete.  Thanks.
 
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PierreLeGrand    @warpig   5/13/2009 1:56:22 PM
 Wrong not strictly speaking no.
 
  But incomplete certainly.
 
  AGAIN g onset is NOT a value on itself it is a "resultante" value and isn't used to compute turn rates nor instantaneous nor sustained.
 
  Maximum Structural Load IS.
 
  More to it; as a peak value it have none when it comes to the stress imposed upon the structure of a modern-equiped FCS fighter for the simple reason that will be prevented to be reached by these FCS when Structural Load values are reached before it.
 
  Simple maths, then there is the more complexe issue of the matrix which picture i have posted and in particular the topics of trancient and functional parameters in both pitch and roll,  none of you are taking it into account.
 
  This makes sure any g onset value you can come up with is innacurate even if it had been a constant instead of a variable.
 
  For the rest it is true that IF it could be imposed upon a structure or a crew member in a sustain maner it would cause damages.
 
  The topic is about the Mirage 2000 and its 11 g instantaneous turn rate, not invalid parameters applied out of context.
 
Regards, PlG
 
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warpig       5/13/2009 3:55:21 PM

 Wrong not strictly speaking no.

 

  But incomplete certainly.

 

  AGAIN g onset is NOT a value on itself it is a "resultante" value and isn't used to compute turn rates nor instantaneous nor sustained.

 

  Maximum Structural Load IS.

 

  More to it; as a peak value it have none when it comes to the stress imposed upon the structure of a modern-equiped FCS fighter for the simple reason that will be prevented to be reached by these FCS when Structural Load values are reached before it.

 

  Simple maths, then there is the more complexe issue of the matrix which picture i have posted and in particular the topics of trancient and functional parameters in both pitch and roll,  none of you are taking it into account.

 

  This makes sure any g onset value you can come up with is innacurate even if it had been a constant instead of a variable.

 

  For the rest it is true that IF it could be imposed upon a structure or a crew member in a sustain maner it would cause damages.

 

  The topic is about the Mirage 2000 and its 11 g instantaneous turn rate, not invalid parameters applied out of context.

 

Regards, PlG



 
 
Okay, now I will take a breath, relax, and engage once again.
 
Did you actually read anything I've posted?  Do you translate posts into French in order to read them (and there would be nothing wrong with doing that; your English is very much better than my French), and thus maybe something "gets lost in the translation"?
 
I ask those strange questions because I have very clearly and very explicitly stated right from the beginning that I am talking about how Gs and G onset rates affect pilots, and not at all about airframes and how Gs affect airframes.  What I brought up has absolutely nothing to do with the M2000 any more or less than it has to do with the F-22 or the MiG-17 or the P-47 or the Fokker DR.1.  No matter what sort of airplane they are in, the aircrew is potentially in danger of G-induced Loss of Consciousness while maneuvering (if the aircraft is capable of surpassing the aircrew's physical tolerances).  Things like muscle tightening and G-suits can help, but if the Gs keep increasing eventually they will suffer GLOC.  The amount of Gs at which they suffer GLOC depends on several things.  One of the variables is the rate at which the load factor is changing.  This rate of change is called the G onset rate.  The same pilot in two test runs, where all other variables are equal, will suffer GLOC at a lower G value if the G onset rate is high, than the G value he will suffer GLOC at if the G onset rate is low.  Therefore a brief high G maneuver can easily be more likely to cause the pilot or especially the back-seater to pass out than a long high G maneuver where the pilot slowly but eventually reaches an even higher level of Gs.  That's basically all I was trying to bring up, but you jumped right away into some weird counter-attack mode and went into a spin.
 
 
 
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